Intervertebral stabilization system

ABSTRACT

An intervertebral stabilization system for at least three vertebrae comprising
         pedicle screws attachable to the vertebrae;   at least one rod for the connection of at least two pedicle screws to form a rigid stiffening system; and   at least one band which is capable of being pre-stressed in tension and which is surrounded in the implanted state of the stabilization system by at least one compressible pressure member arranged between two adjacent pedicle screws for the connection of the pedicle screws to form an elastic support system,
 
wherein a common pedicle screw is associated both with the stiffening system and with the support system and the band is can be connected or is connected to the rod by means of a band attachment.

This application is a continuation of U.S. application Ser. No.11/570,975, filed Dec. 20, 2006; which was the 371 National Stage ofInternational Application No. PCT/EP2005/012580, filed Nov. 24, 2005;which claims priority to European Patent Application No. 04030000.6,filed on Dec. 17, 2004, which are all incorporated herein by reference.

The invention concerns an intervertebral stabilization system for atleast three vertebrae.

With deformations or degenerative changes of the vertebral column, itmay be necessary to stabilize the individually affected unstablevertebral column segment by means of surgery.

In this respect, the stiffening of the affected vertebral column segmentis known. With such a partial vertebral column stiffening, theintervertebral discs are at least partially removed; bony tissues areembedded between the vertebrae to be stiffened; and the vertebrae to bestiffened are connected rigidly with one another with screws and atleast one rod. The stiffening of the vertebral column segment, however,makes the adjacent vertebrae more stressed with bending and stretchingmovements of the vertebral column than before the stiffening.

Alternatively, “with easier cases,” especially before an intervertebraldisc incident also appears, an implant has been more recently used whichsupports the affected vertebral column segment posteriorly but does notstiffen, and thus to a large extent maintains the mobility of theaffected vertebrae. An elastic band with pliable spacers is thereby usedbetween screws fastened on the vertebrae. The elastic band limits thebending movement, whereas the spacers limit the stretching movement.

The problem of the invention is to create a device of the type mentionedinitially, which is designed so as to stiffen an unstable vertebralcolumn segment in such a way that the vertebral column is stressed aslittle as possible with bending and stretching movements, in particular,in order to prevent further operations or at least to delay them as muchas possible.

The solution of this problem takes place with the features of claim 1,particularly in that pedicle screws which can be fastened on thevertebrae, a rod to connect at least two pedicle screws to a rigidstiffening system, and a band that can be prestressed when pulled andthat, when the stabilization system is implanted, is surrounded by atleast one compressible pressure body that is located between twoadjacent pedicle screws and is provided to connect the pedicle screws toan elastic support system wherein a common pedicle screw is correlatedboth with the stiffening system and also with the support system, andthe band is, or can be connected with the rod by means of aband-fastening.

The invention is consequently characterized in that the rigid stiffeningsystem combines the known prior art, which comprises the rod, with theelastic support system, also known from the prior art, which comprisesthe band and the pressure body. The elastic support system, previouslyused as an alternative to the known rigid stiffening system is used inaccordance with the invention together with the rigid stiffening systemfor the stabilization of an unstable vertebral column segment.

The rod of the stiffening system is designed for the stiffening of anunstable vertebral column segment comprising at least two vertebrae. Theband, which is connected with the rod when the stabilization system isimplanted and is or can be connected with the rod when the system is notimplanted, is used to support at least one vertebra adjacent to thestiffened vertebral column segment. The rod and the band are fastened tothe vertebrae to be stabilized by means of the pedicle screws.

Preferably, at least two stiffening systems, in particular, two rods,are provided, which are situated to the left and to the right of pinextensions of the affected vertebrae when the stabilization system isimplemented, wherein preferably the two stiffening systems are or can beconnected with one another. Furthermore, several support systems can beprovided. In particular, two support systems that are connected to oneend of the stiffening system can be provided for the stiffening systemfor each system or for several systems. Basically, several stiffeningand support systems can also be provided that are alternately connectedwith one another in the implanted state.

In the implanted state of the stabilization system the band of thesupport system is prestressed when pulled. The pressure body, on theother hand, is in a compressed state—that is, it is prestressed withpressure. The rod and the band are thereby connected with one anothervia a band-fastening—that is, the band is fastened to the rod orvice-versa. The common pedicle screw, on which or in whose vicinity theconnection of the band with the rod is usually designed in the implantedstate of the stabilization system, is equally used by the rigidstiffening system and the elastic support system. If the band-fasteningis located approximately in the middle between two pedicle screws, anarbitrary one of the two pedicle screws can be regarded as the commonpedicle screw.

By means of the elastic support system that follows it as an extensionof the rigid stiffening system, or by means of the elastic supportsystems that follow it on both sides of the rigid stiffening system, thevertebra(e), following the vertebrae connected rigidly with one anotherby the stiffening system are supported, so that these adjacent vertebraeare not exposed to increased stresses with bending and stretchingmovements of the vertebral column.

Advantageous embodiments of the invention are also indicated in thesubclaims, the description, and the drawing.

Preferably, the band-fastening is designed as a clamping device for theclamping of the band. By means of the clamping forces of theband-fastening designed as a clamping device, it is possible to hold theband, which is under traction in the implanted state of thestabilization system, in a particularly safe and reliable manner.

It is also preferred for the band-fastening to comprise an end of therod, a separate component, and/or the common pedicle screw.

The invention is described below, as an example, with reference to thedrawing, which comprises various embodiments, the individual features ofwhich—to the extent that it makes sense—can be combined arbitrarily withone another. The figures show the following:

FIGS. 1 to 7, band-fastenings of a stabilization system in accordancewith the invention that embrace an end of the rod;

FIGS. 8 to 10, band-fastenings of a stabilization system in accordancewith the invention that embrace a separate component; and

FIGS. 11 to 15, band-fastenings of a stabilization system in accordancewith the invention that embrace a common pedicle screw.

The embodiments explained below show only the part of the stabilizationsystem which is needed for the description of the connection between therod of the stiffening system and the band of the support system. Thesame components of the different embodiments of the invention, or thosecomponents which correspond to one another, are designated with the samereference symbols.

FIG. 1 shows a stabilization system in accordance with a firstembodiment of the invention with a rigid metal rod 11 of a rigidstiffening system, which is otherwise not depicted, wherein the rod 11has an end 13, which has a larger diameter than the middle part 15 ofthe rod 11. The end of the rod 11, which is designed as the head 13 andwhich can be used, simultaneously, as the stop for an undepictedpressure body, is at least part of a band-fastening and has anessentially cylindrical hollow space 17, into which, via a band entryopening 19, an end 21 of an elastic band 23, made of plastic, forexample, of an otherwise not undepicted elastic support system isintroduced or can be introduced.

The band-fastening also comprises a sleeve-like clamping element 27,which is (FIG. 1 c) or can be (FIG. 1 a) introduced into the cavity 17along the introduction direction 25 of the end 21 of the band 23 and isclosed in the circumferential direction; the clamping element is pushedto the end 21 of the band 23 and is designed to clamp the end 21 of theband 23 with the head 13 of the rod 11, introduced into the cavity 17 ofthe rod 11. The sleeve-like clamping element 27 can also be designatedas a clamping sleeve or as a clamping ring.

The clamping sleeve 27 is designed so that it tapers conically on itsoutside when it has not been introduced into the cavity 17 of the rod11, wherein the wall thickness of the clamping sleeve 27 increasestoward the end that has the larger outside diameter. In accordance withFIG. 1 d, a protrusion 29, which runs along the circumference, isdirected inwards and constricts the inside diameter of the clampingsleeve 27, can be designed on the inside of the clamping sleeve 27 onthe end which has the larger outside diameter. In accordance with FIG. 1e, the clamping element 27 can be slit, in particular, on two oppositesides. Basically, the clamping sleeve can have a protrusion and can alsobe slit.

FIGS. 1 a to 1 c show the connection of the rod 11 with the band 23.First, the clamping sleeve 27 is pushed onto the end 21 of the band 23that is to be introduced in the cavity 17 or rod 11 in such a way thatthe end of the conical clamping sleeve 27 that has the larger outsidediameter faces the middle of the band 23 (FIG. 1 a). Afterwards, the end21 of the band 23, which is provided with the clamping sleeve 25 [sic;27] is pressed into the cavity 17 of the head 13 of the rod 11 by meansof a suitable tool, along the introduction direction 25 (FIG. 1 b).

The end of the clamping sleeve 27 that has the larger outside diameteris compressed onto the inside diameter of the cylindrical cavity 17 ofthe rod 11, which at least essentially corresponds to the smalleroutside diameter of the other end of the clamping sleeve 27. Whenassembled (FIG. 1 c), the inside diameter of the clamping sleeve 27decreases toward the end which originally has a larger outside diameter,because of the wall thickness of the clamping sleeve 27, which increasesin this direction—that is, the passage of the clamping sleeve 27 isconstricted in the direction of the band entry opening 19 of the cavity17 of the head 13 of the rod 11, so that the band 23 is effectivelyclamped.

The clamping force of the band-fastening can be additionally reinforcedby the protrusion 29 shown in FIG. 1 d. A slit clamping sleeve 27 (FIG.1 e) offers the advantage that, upon introduction of the clamping sleeve27 into the cavity 17 of the head 13 of the rod 11, additional space formaterial deformation is available, so that the pressing-in process canbe carried out with an overall smaller expenditure of force.

FIG. 2 shows a stabilization system in accordance with a secondembodiment of the invention. In contrast to the embodiment in FIG. 1,the band-fastening in accordance with FIG. 2 comprises two clampingsleeves 27, 31 braced against one another.

Analogous to FIG. 1, the first clamping sleeve 27 is shoved onto the end21 of the band 23 to be introduced into the cavity 17 of the rod 11 inthe embodiment example according to FIGS. 2 a and 2 b in such a way thatthe end of the conical first clamping sleeve 27, which has the largeroutside diameter, faces the middle of the band 23 (FIG. 2 a). The secondclamping sleeve 31, which is used as the conical pressing ring, is, in aminor image to the first clamping sleeve 27 and relative to a planewhich is perpendicular to the introduction direction 25, pressed intothe cavity 17 of the head 13 of the rod 11 (FIG. 2 a). To connect theband 23 with the rod 11, the first clamping sleeve 27 is pressed alongthe introduction direction 25 into the cavity 17 of the head 13 of therod 11, wherein the first clamping sleeve 27 is braced with the secondclamping sleeve 31.

The first clamping sleeve 27 is deformed in such a way that the band 23is effectively clamped in (FIG. 2 b). Basically, several conicalpressing rings can also be provided.

In the embodiment example in accordance with FIGS. 2 c and 2 d, the twoclamping sleeves 27, 31 are exchanged with respect to their orientationsin comparison to the embodiment example according to FIGS. 2 a and 2 b,wherein the first clamping sleeve 27 is pressed onto the end 21 of theband 23 in the unintroduced state (FIG. 2 c). When assembled, the end 21of the band 23, provided with the first clamping sleeve 27, isintroduced along the introduction direction 25 into the cavity 17 of thehead 13 of the rod 11. Subsequently the second clamping sleeve 31 ispressed into the cavity along the introduction direction (FIG. 2 d).

FIG. 3 shows the stabilization system in accordance with a thirdembodiment of the invention.

The band-fastening of the embodiment example in accordance with FIGS. 3a to 3 c comprises a clamping pin 33 that can be introduced under pressfit into the cavity 17 transverse to the introduction direction 25 ofthe end 21 of the band 23; the pin is designed to clamp the end of theband, which can be introduced into the cavity 17 of the rod 11 with thehead 13 of the rod 11. The clamping pin 33 introduced through an opening35 into the cavity 17 of the rod 11 can be designed round (FIG. 3 a) orwedge-shaped (FIG. 3 b) at its tip, which tip acts with radial pressureon the introduced end 21 of the band 23 relative to its longitudinalextension. A greater contact pressure on the clamped-in band 33 can beattained with a wedge-shaped clamping pin 33.

Diametrically opposite the opening 35 through which the clamping pin 33is introduced into the cavity 17, a cavity 17 is formed on the inside ofthe head 13 of the rod 11, which limits the cavity 17; the pressed-inclamping pin 33 is pressed into the hollow. The clamping force on theband 23 can be increased additionally by the deviation of the band 23created in this way. In order to facilitate the introduction of the band23, an introduction aid designed as a sleeve 39 can be stuck on the end21 of the band 23 to be introduced (FIGS. 3 a and 3 b). As can be seenin FIG. 3 c, one, two, three, or any number of clamping pins 33, 41, 43can be provided.

In the embodiment example in accordance with FIG. 3 d, theband-fastening comprises a pressure element, for example, a clampingscrew 137 that can be introduced into the cavity of the head 13 of therod 11 via an opening 133 transverse to the introduction direction 25,and is designed for the clamping of the end 21 of the band 23 within thehead 13 of the rod 11. Furthermore, a band exit opening 135 lying deeperand opposite the band entry opening 19 is provided, and through it theend 21 of the band 23 can again be moved out or is moved out of thecavity of the rod 11. The part of the band 23 that is not introducedinto the head 13 is surrounded by a pressure body 75 that can also bedesignated as a cushion. The rod 11 is or can be placed into a recess139 of a common pedicle screw 67 that is formed tuning fork-like on itsupper end in the assembled state and by means of a clamping screw 141 isor can be fastened to it. The upper end of the common pedicle screw 67can also be designed as a passage, however.

FIG. 4 shows a stabilization system according to a fourth embodiment ofthe invention in which the cavity 17 is constricted toward the bandentry opening 19 of the head 13 of the rod 11. The constriction isthereby formed with the end 21 of the band 23 introduced into the cavity17 by reshaping the head 13 of the rod 11. By the constriction, the band23 is effectively clamped (FIGS. 4 b, 4 f, and 4 h). Analogous to FIG.3, it is also possible to use a sleeve 39 as an introduction aid for theend 21 of the band 23 in the embodiment according to FIG. 4 also, as isshown in FIGS. 4 a and 4 b.

In the embodiment example according to FIGS. 4 a and 4 b, the head 13 ofthe rod 11 exhibits a projection 45 that juts out against theintroduction direction 25 and runs along the circumference of the rod11. The reshaping of the projection 45 from the position shown in FIG. 4a to the position shown in FIG. 4 b, in which the orientation of theprojection 45 is rotated, as it were, by 90°, can be attained, forexample, by roll-pressing (FIG. 4 c) or by using two half-shells (FIG. 4d).

In the embodiment example according to FIGS. 4 e and 4 f, the head 13 ofthe rod 11 does not have a projection before the reshaping. Rather, whenpressing in the end 21 of the introduction end 21 of the band 23, thearea of the head 13 of the rod 11 forming the limit of the band entryopening 19 is deformed by means of a punch 131 in such a way, inparticular, pressed inwards so that the cavity 17 to the band entryopening 19 of the head 13 of the rod 11 is constricted.

The embodiment example according to FIGS. 4 g and 4 h is characterizedin that, before the reshaping the outside diameter of head 13 of the rod11 and the related wall thickness of the head 13 in the area of thecavity 17 increase in the direction opposite the introduction direction25 of the band 23. With the reshaping of the head 13 of the rod 11, apress ring 47 having an inside diameter that essentially corresponds tothe outside diameter of the middle part 15 of the rod 11 moves againstthe introduction direction 25. The head 13 of the rod 11 is therebycompressed to the inside diameter of the press ring 47 so that thecavity 17 is constricted toward the band entry opening 19 of the head 13because of the wall thickness of the head 13, which increases in thisdirection.

FIG. 5 shows a stabilization system according to a fifth embodiment ofthe invention in which the connection of the band 23 with the rod 11 isbrought about by the reshaping of the head 13 of the rod 11. The head 13of the rod 11 and the cavity 17 within the head 13 are shapedspherically, at least before the reshaping, wherein the diameter of theband entry opening 19 is smaller than the cavity 17 formed in the head13. The cavity 17 is thus already constricted before the reshaping forthe band entry opening 19.

To bring about the connection of the band 23 with the rod 11, a ring 49,in particular a tapered ring 49′, is first shoved onto the end 21 of theband 23 (FIG. 5 a). The end 21 of the band 23, provided with the ring49,49′, is then introduced into the cavity 17 of the head 13 of the rod11, wherein the head 13 of the rod 11 and thus also the ring 49, 49′ iscompressed so that the band 23 is effectively clamped (FIG. 5 b). It ispossible to additionally increase the pressing force exerted on the band23 by tapering the ring 49′.

FIG. 6 shows a stabilization system according to a sixth embodiment ofthe invention. The embodiment according to FIG. 6 essentiallycorresponds to the embodiment according to FIG. 1, with the differencethat the band-fastening also comprises an inlay 51, made, in particular,of metal or plastic, which is worked into the end 21 of the band 23, inparticular, centrically, which can be (FIG. 6 a) or is (FIG. 6 b)introduced into the cavity of the rod 11 and which extends along theintroduction direction 25 of the band 23.

The inlay 51 is designed in the shape of a pin and comprises a head 53and a shaft 55, wherein the diameter of the head 53 is larger than thatof the shaft 55. The head 53 protrudes, in part, from the end 21 of theband 23. By means of the inlay 51, it is possible to increase thepressing pressure, exerted on the clamped-in band 23, and thus theholding force of the connection between the band 23 and the rod 11,brought about by the band-fastening.

FIG. 7 shows a stabilization system according to a seventh embodiment ofthe invention. In FIG. 7, the band 23 is widened to form a large numberof strength carriers, in particular, fibers of the band 23, and can be(FIG. 7 b) or is (FIG. 7 c) pressed into the cavity 17 of the head 13 ofthe rod 11 by means of an insert 57. In order to attain the widening,the end 21 of the band 23 is brushed upward by means of a brushing tool59 (FIG. 7 a).

To press in, the insert 57, which is designed as a ring insert in FIG.7, is threaded onto the band 23 and introduced into the cavity 17 of thehead 13 so that the individual fibers, which project radially in alldirections toward the introduction direction 25, are clamped between thefront side of the ring insert 57 and the limit of the cavity 17. Inorder to increase the holding forces of such a connection between theband 23 and the rod 11, a centrally positioned spike 61, which protrudesinto the cavity 17 against the introduction direction 25, and a lug 63,which runs around the spike 61 with the lug also protruding into thecavity 17 against the introduction direction 25, can be provided (FIG. 7d).

In accordance with an undepicted eighth embodiment of the invention, theend of the band that can be introduced into the cavity is cemented,particularly by means of glue or cement. In this way, the fibers of theband are joined with one another so that the sliding of the individualfibers against one another is prevented and thus it is possible toattain a greater holding force for the connection between the band andthe rod.

In accordance with an undepicted ninth embodiment of the invention, theend of the band that can be introduced or is introduced into the cavityis a formed through melting, shaping, and subsequent hardening. Inparticular, the shape can be such that the end of the band is designedas a hook after curing.

FIG. 8 shows a stabilization system according to a tenth embodiment ofthe invention, in which the band-fastening comprises a separatecomponent 65, wherein the rod 11 is, or can be fastened to theband-fastening—that is, in particular, on the separate component 65 andalso on a common pedicle screw 67. In particular, the separate component65 is not, or cannot be, fastened directly on the common pedicle screw67.

FIGS. 8 a and 8 b show a stabilization system when implanted. The rod 11connects two pedicle screws 67, 69, which comprise the common pediclescrew 67 and are each fastened on a vertebra of a vertebral column toform a rigid stiffening system. The band 23, which is prestressed whenpulled, connects three pedicle screws 67,71, 73, which comprise thecommon pedicle screw 67, wherein the pedicle screws 71,73 are also eachfastened to a vertebra to form an elastic support system. Compressedpressure bodies 75, 77 are located between the pedicle screws 67 and 71and between the pedicle screws 71 and 73; they completely surround theband 23 in the circumferential direction. The common pedicle screw 67 iscorrelated with the stiffening system and also the support system.

The band 23 and the rod 11 are connected with one another by theseparate component 65. The separate component 65 extends essentiallyperpendicular to the longitudinal extension of the band 23 orperpendicular to the longitudinal extension of the rod 11, whichessentially run staggered parallel and medial/lateral with respect toone another, whereas, at least with the embodiments in accordance withFIGS. 1 to 7, the longitudinal extension of the band and thelongitudinal extension of the rod run, at least without a medial/lateralstaggering, parallel to one another. In accordance with FIG. 8, theseparate component 65 can be located, relative to the common pediclescrew 67, both on the side of the support system (FIG. 8 a) and also onthe side of the stiffening system (FIG. 8 b).

The embodiment example in accordance with FIG. 8 c shows a separatecomponent 65 that has two tube-like passages 79, 81 for the fastening ofthe band 23 and for the fastening of the rod 11. The passage 79 to thefastening of the rod 11 has an upper and a lower half-shell 83, 85,which can be moved relative to one another by means of a holding screw87 in order to clamp the rod 11. Perpendicular to the passage 81 for thefastening of the band 23, there is an opening 89 into which a pressureelement 91, for example, a clamping screw for the clamping of the band23, can be inserted or is inserted on the common pedicle screw 67.

The separate component 65 can be constructed in several parts, wherein,in particular, different relative positions of the parts of the separatecomponent 65 can be implemented relative to one another. Such acomponent 65 is shown in the embodiment examples according to FIGS. 8 d,8 e, and 8 f. The separate component 65 has a tube-like access orpassage 81 for the band 23, which can be fastened by means of theclamping screw 91 introduced through the opening 89. The rod 11, whichcan be introduced in the sector-wise open passage 79 when implanted, canalso be fastened to the separate component 65 analogous to band 23 bymeans of a clamping screw 93 introduced through an opening 95. Theseparate component 65 in which the passage is formed is provided with arotating axle 97 between the one part of the separate component 65 inwhich the access or passage 81 is formed, and the other part of theseparate component 65 in which the passage 79 is formed, so that theparts of the separate component 65 can be rotated relative to oneanother. An adjusted relative position of the two parts relative to oneanother can be locked by means of a locking screw 99.

Other embodiment examples of the separate component 65 are shown inFIGS. 8 g and 8 h, either in perspective (FIG. 8 g) or in a top ortransverse view (FIG. 8 h). In particular, it is clear that, in anangularly constructed one-part separate component 65 or a multipart,separate component 65, the distance of the parts of the separatecomponent 65 relative to one another can be changed by lineardisplacement.

The embodiment example according to 8 i shows a separate component 65,into which, an undepicted rod can be introduced from one side and anundepicted band from the other, opposite side. The separate component65, which, to a certain extent is designed as a double sleeve, has twotube-like accesses 79, 81. Furthermore, openings 89, 95 are provided inorder to connect the rod and the band with the separate component 65 bymeans of undepicted clamping screws.

FIG. 9 shows a stabilization system in accordance with an eleventhembodiment of the invention in which the band-fastening comprises aseparate component 65, wherein an undepicted rod is, or can be fastenedonto the band-fastening 65, and the band-fastening 65 to an undepictedcommon pedicle screw. In particular, the rod is not, or cannot be,fastened directly to the common pedicle screw.

In the embodiment example according to FIGS. 9 a and 9 b, the separatecomponent 65 has a central passage 101 provided for the fastening of theseparate component 65 to the common pedicle screw. Furthermore, twopassages or accesses 79, 81, running perpendicular to the centralpassage 101 and parallel to one another in the separate component 65,are designed for the fastening of the band and the rod. For the clampingof the band, an opening 89 is provided into which an undepicted clampingscrew can be inserted. The passage 79 is slit and can be constricted bymeans of the common pedicle screw so that the rod can be effectivelyclamped.

FIG. 10 shows a stabilization system according to a twelfth embodimentof the invention, in which the band-fastening comprises a separatecomponent 65, wherein the band-fastening and the rod are, or can befastened to the common pedicle screw 67. In particular, the rod 11 isnot, or cannot be, fastened directly to the separate component 65.

The separate component 65 according to FIG. 10 a has a sleeve or anaccess for fastening band 23 and a fastening ring 103 for fastening tothe common pedicle screw 67, wherein the longitudinal axis of the sleeve81 and the middle axis of the fastening ring 103 are essentiallyperpendicular to one another. The fastening ring 103 can also have arecess 105 for the rod 11 (FIG. 10 b).

FIG. 11 shows a stabilization system according to a thirteenthembodiment of the invention, in which the band-fastening comprises thecommon pedicle screw 67, wherein the rod 11 can be fastened, or isfastened, to a separate component 107, which is, or can be fastened tothe common pedicle screw 67. In particular, the rod 11 is not, or cannotbe, fastened to the common pedicle screw 67.

The separate component 107 according to FIG. 11 has two laterally placedclick arms 109 with which the separate component 107 is, or can befastened according to a type of click closure to the common pediclescrew 67. The click arms 109 lock into lateral depressions 111 of thecommon pedicle screw 67 for fastening. Moreover, the separate component107 has an undepicted access into which the rod 11 is, or can beintroduced and an opening 95 into which an undepicted clamping screw forthe fastening of the rod 11 can be introduced. Moreover, an opening 113is provided through which an undepicted fastening screw for theadditional fastening of the separate component 107 to the common pediclescrew 67 can be introduced or is introduced.

FIG. 12 shows a stabilization system according to a fourteenthembodiment of the invention, in which the band-fastening comprises thecommon pedicle screw 67, wherein the rod 11 is, or can be fastened tothe common pedicle screw 67 by means of a crossbar 115 which, whenimplanted, is essentially perpendicular to the longitudinal extension ofthe band 23.

The stabilization system depicted in FIG. 12 shows a stiffening system,followed on its two ends by a support system—that is, two common pediclescrews 67 and two crossbars 115 are present. The crossbars 115, shapedessentially in the form of an S, can have a passage 79, which is opensector-wise on their end, correlated with the rod 11, or a passage 79,which is closed in the circumferential direction. To fasten a crossbar115 on a common pedicle screw 67, a longish hole 117 is formed on theend correlated with the common pedicle screw 67 so that various relativepositions are possible between the common pedicle screw 67 and the rod11. The longitudinal extension of the rod 11 and the longitudinalextension of the band 23 run parallel and staggered medially/laterallyrelative to one another.

FIG. 13 shows a stabilization system according to a fifteenth embodimentof the invention, in which the band-fastening comprises the commonpedicle screw 67, wherein the rod 11 is, or can be fastened to thecommon pedicle screw 67 and the common pedicle screw 67 has a commonpassage 119 for the band 23 and the rod 11.

In the embodiment example according to FIG. 13, the band 23 and the rod11 are located next to one another or above one another within thecommon passage 119 of the common pedicle screw 67. The band 23 and therod 11 are jointly compressed by means of an undepicted clamping screwwhich is, or can be introduced through an opening 121 formed in thecommon pedicle screw 67 so that both the band and also the rod 11 areeffectively clamped.

FIG. 14 shows a stabilization system according to a sixteenth embodimentof the invention. Analogous to the embodiment according to FIG. 13, theembodiment according to FIG. 14 has a common passage 119 for the band 23and the rod 11 and an opening 121 to introduce a clamping screw.

In the embodiment example according to FIG. 14 a, the band 23 is, or canbe pulled over the rod 11, in contrast to the embodiment according toFIG. 13. Moreover, a sleeve 123 is, or can be shoved into the commonpassage 119 that in turn again surrounds the band 23. Otherwise, theband 23 and the rod 11 can be clamped analogous to the embodiment inFIG. 13. An embodiment example is shown in FIG. 14 b in which the end 21of the band 23 is, or can be introduced into rod 11, similar to what isshown in FIGS. 1 to 7, wherein by means of a clamping screw 141, whichis, or can be introduced into the common pedicle screw 67 through anopening 143, the band 23 and the rod 11 can be clamped in.

In the embodiment example in accordance with FIG. 14 c, the commonpedicle screw 67 is designed as a tuning fork on its upper end, so thata recess 139 is formed between two prongs 149 into which a rod is, orcan be laid. The mounting of the rod on the common pedicle screw 67takes place by means of a clamping screw 141 that is, or can be insertedinto the bore sections 143 of the two prongs 149, wherein the boresections have an internal thread. The end 13 of the rod 11, which isdesigned for connection with the end 21 of the band 23, can have adiameter larger than that of a middle part 15 of the rod 11 (FIG. 14 d).The band 23 is, or can be connected with the rod 11 by means of aclamping screw 137 that is, or can be introduced through an opening 133into the rod 11.

To guide the rod 11 in the assembly with the common pedicle screw 67 orfor the correct positioning of the rod 11 with regard to the commonpedicle screw 67, guiding means, for example, one or more round orangular pegs 145 are formed on the head 13 of the rod 11 (FIG. 14 d, 14e, 14 g) that mesh into guiding means of the common pedicle screw 67(FIGS. 14 c, 14 f), for example, one or more recesses, slots, or grooves147, which, in particular, correspond to the bore sections 143 of thetwo prongs 149 (FIG. 14 c).

Moreover, at least one, particularly plate-shaped, flange 151 orientedperpendicular to the longitudinal axis of the rod 11 can be provided(FIG. 14 e, 14 g, 14 h) that is connected with the rod 11 and permitscorrect positioning of the rod 11 with regard to the common pediclescrew 67 or offers a guide when the stabilization system is assembled.If the flange 151 is designed as a closure of the end 13 of the rod 11,the flange can also be used simultaneously as a stop 151 for a pressurebody 75 of a support system of the stabilization system.

FIG. 15 shows a stabilization system in accordance with a seventeenthembodiment of the invention, in which the band-fastening comprises thecommon pedicle screw 67, wherein an undepicted rod is, or can befastened to the common pedicle screw 67 and the band 23 is, or can beclamped between the pressure mechanism, in particular, a nut 125, andthe common pedicle screw 67, wherein the common pedicle screw 67 has apassage 127 for the rod.

The rod introduced into the passage 127 is effectively clamped by meansof a threaded pin 129 that has a continuous external thread and whichis, or can be introduced through an opening 121 into the common pediclescrew 67. The nut 125 is placed on the end of the threaded pin 129 thatprojects from the common pedicle screw 67 in order to clamp the band 23between the common pedicle screw 67 and the nut 125. For this purpose,the end 21 of the band 23 to be clamped is made as a loop into which thethreaded pin 129 meshes.

REFERENCE SYMBOL LIST

-   11 Rod-   13 Head-   15 Middle part-   17 Cavity-   19 Band entry opening-   21 End-   23 Band-   25 Introduction direction-   27 Clamping sleeve-   29 Protrusion-   31 Clamping sleeve-   33 Clamping rod-   35 Opening-   37 Hollow-   39 Introduction aid-   41 Clamping rod-   43 Clamping rod-   45 Projection-   47 Press ring-   49, 49′ Ring, tapered ring-   51 Inlay-   53 Head-   55 Shaft-   57 Insert-   59 Brush tool-   61 Spike-   63 Lug-   65 Separate component-   67 Common pedicle screw-   69 Pedicle screw-   71 Pedicle screw-   73 Pedicle screw-   75 Pressure body-   77 Pressure body-   79 Passage, access-   81 Passage, access, sleeve-   83 Upper half-shell-   85 Lower half-shell-   87 Holding screw-   89 Opening-   91 Clamping screw-   93 Clamping screw-   95 Opening-   97 Rotating axle-   99 Locking screw-   101 Central passage-   103 Fastening ring-   105 Recess-   107 Separate component-   109 Click arm-   111 Depression-   113 Opening-   115 Crossbar-   117 Longish hole-   119 Common passage-   121 Opening-   123 Sleeve-   125 Nut-   127 Passage-   129 Threaded rod-   131 Punch-   133 Opening-   135 Band exit opening-   137 Clamping screw-   139 Recess-   141 Clamping screw-   143 Opening, bore sections-   145 Peg-   147 Recess-   149 Prong-   151 Flange, stop

1. An intervertebral stabilization system comprising: a first vertebralfastener configured to be secured to a first vertebra; a secondvertebral fastener configured to be secured to a second vertebra; athird vertebral fastener configured to be secured to a third vertebra; arigid member having an end region including a first flange and a secondflange spaced from the first flange by a medial portion, the end regionfurther including bore; and an elastic support system including a spacerand a flexible member sized to insert into the spacer; wherein an endportion of the flexible member extends into the bore of the end regionof the rigid member, and the spacer is positionable in abutment with thefirst flange; wherein the second vertebral fastener has a head portionincluding a channel extending from one side of the head portion to asecond side of the head portion, wherein the medial portion of the endregion of the rigid member is positionable in the channel and securablethereto, the first flange is positionable adjacent the first side of thehead portion, and the second flange is positionable adjacent the secondside of the head portion; and wherein at least a portion of the rigidmember is positionable between the first vertebral fastener and thesecond vertebral fastener, and at least a portion of the flexible memberis positionable between the second vertebral fastener and the thirdvertebral fastener.
 2. The intervertebral stabilization system of claim1, wherein the rigid member is configured to extend from the second sideof the second vertebral fastener toward the first vertebral fastener,and the flexible member and the spacer are configured to extend from thefirst side of the second vertebral fastener toward the third vertebralfastener.
 3. The intervertebral stabilization system of claim 1, whereinat least a portion of the bore of the end region of the rigid member ispositionable in the channel of the second vertebral fastener.
 4. Theintervertebral stabilization system of claim 1, wherein the first flangeis configured to space the spacer from the head portion of the secondvertebral fastener.
 5. The intervertebral stabilization system of claim1, wherein the medial portion of the end region of the rigid member issecurable in the channel of the head portion of the second vertebralfastener with a set screw.
 6. The intervertebral stabilization system ofclaim 1, wherein the rigid member is configured to provide rigid supportbetween two or more vertebrae of a spinal column.
 7. The intervertebralstabilization system of claim 1, wherein the elastic support system isconfigured to provide dynamic support between two or more vertebrae of aspinal column.